%% tikz-layers.sty
%% Copyright 2018 Rui Moutinho
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\ProvidesPackage{tikz-layers}[2018/02/15 v0.9 Installs basic layers via TikZ]

\RequirePackage{tikz}
\usetikzlibrary{backgrounds}

\pgfdeclarelayer{behind}
\pgfdeclarelayer{above}
\pgfdeclarelayer{glass}

\pgfsetlayers{background,behind,main,above,glass}

\tikzset{
    on layer/.style = {execute at begin scope={\pgfonlayer{#1}}, execute at end scope={\endpgfonlayer}},
    on behind layer/.style = {on layer=behind},
    on above layer/.style = {on layer=above},
    on glass layer/.style = {on layer=glass},
}